[英]how do i use do-while loop to prompt for and read the strings from the user? Array Lists
我的代码一直出现错误,特别是在
ArrayList<String> input[i]= (i + 1) + " " + ArrayList<String> input[i];
错误告诉我“;预期”我在这里做错了什么?
Scanner scnr = new Scanner(System.in);
System.out.println("how many lines of text do you want to enter");
int numLines = 0;
numLines = scnr.nextInt();
System.out.println();
ArrayList lines = new ArrayList();
scnr.nextLine();
int i = 0;
do{
System.out.println("Enter your text: ");
String text = scnr.nextLine();
ArrayList<String> input = new ArrayList<String>();
i++;
for (i = 0; i < numLines; i++)
{
ArrayList<String> input[i]= (i + 1) + " " + ArrayList<String> input[i];
}
for (String element: ArrayList<String> Lines)
{
System.out.println(element);
}
} while(i != 0);
正如你所拥有的
ArrayList<String> input = new ArrayList<String>();
在您的循环中,这意味着它将为该循环的每次迭代重新声明和初始化,因此请将此声明移至您的do
之前
接下来,要添加到此循环中,请使用add
方法
String text = scnr.nextLine();
input.add (text);
为简化起见,您不需要do
,因为您要循环多次
Scanner scnr = new Scanner(System.in);
System.out.println("how many lines of text do you want to enter");
int numLines = scnr.nextInt();
System.out.println();
scnr.nextLine();
ArrayList <String> lines = new ArrayList <> ();
for (int i = 0; i < numLines; i++) {
System.out.println("Enter word...");
String text = scnr.nextLine();
lines.add(text);
}
要打印您的列表,您可以执行以下操作
for (int x = 0; x < lines.size(); x++) {
System.out.println (lines.get(x));
}
输出
how many lines of text do you want to enter
5
Enter word...
one
Enter word...
two
Enter word...
three
Enter word...
four
Enter word...
five
one
two
three
four
five
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.